fetching configuration from CBS at application bootstrap

Change-Id: Ibaa56c38b87fc8b8cfa858f74b7bc201bd507b37
Issue-ID: DCAEGEN2-1544
Signed-off-by: grabinsk <maciej.grabinski@nokia.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/prh-app-server/src/main/java/org/onap/dcaegen2/services/bootstrap/CbsJsonToPropertyMapConverter.java b/prh-app-server/src/main/java/org/onap/dcaegen2/services/bootstrap/CbsJsonToPropertyMapConverter.java
new file mode 100644
index 00000000..bf4077b9
--- /dev/null
+++ b/prh-app-server/src/main/java/org/onap/dcaegen2/services/bootstrap/CbsJsonToPropertyMapConverter.java
@@ -0,0 +1,64 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PNF-REGISTRATION-HANDLER
+ * ================================================================================
+ * Copyright (C) 2019 NOKIA Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dcaegen2.services.bootstrap;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+
+class CbsJsonToPropertyMapConverter {
+
+    private static final String CBS_CONFIG_ROOT_PROPERTY = "config";
+
+    Map<String, Object> convertToMap(JsonObject jsonObject) {
+        verifyExpectedCbsJsonFormat(jsonObject);
+        JsonObject config = jsonObject.getAsJsonObject(CBS_CONFIG_ROOT_PROPERTY);
+        return config.entrySet().stream().collect(
+                Collectors.toMap(Map.Entry::getKey, entry -> unpack(entry.getValue())));
+    }
+
+    private static void verifyExpectedCbsJsonFormat(JsonObject jsonObject) {
+        if (!jsonObject.has(CBS_CONFIG_ROOT_PROPERTY)) {
+            throw new IllegalArgumentException("Missing expected '" + CBS_CONFIG_ROOT_PROPERTY + "'" +
+                    " property in json from CBS.");
+        }
+    }
+
+    private Object unpack(JsonElement value) {
+        if (value.isJsonPrimitive()) {
+            JsonPrimitive primitiveValue = value.getAsJsonPrimitive();
+            if (primitiveValue.isString()) {
+                return primitiveValue.getAsString();
+            }
+            if (primitiveValue.isBoolean()) {
+                return primitiveValue.getAsBoolean();
+            }
+            if (primitiveValue.isNumber()) {
+                return primitiveValue.getAsLong();
+            }
+        }
+        return value;
+    }
+
+}